From the Overview: "On November 30, 2018, President Trump and the leaders of Canada and Mexico signed the United States-Mexico-Canada Agreement (USMCA). USMCA would revise and modernize the North American Free Trade Agreement (NAFTA), in place since 1994. Pursuant to trade promotion authority (TPA), the Administration notified Congress of its intention to enter into USMCA. On December 10, 2019, the United States, Canada, and Mexico agreed to a protocol of amendment to the proposed USMCA. The revisions include modifications to key elements of the original text regarding dispute settlement, labor and environmental provisions, intellectual property rights (IPR) protection, and steel and aluminum requirements in the motor vehicle industry rules of origin. Amendments also provide for a facility-specific rapid response labor mechanism to address worker rights provisions. The Trump Administration submitted the proposed implementing legislation to Congress on December 13, 2019. On the same day, the USMCA Implementation Act (H.R. 5430) was introduced in the House of Representatives. On December 16, the companion bill was introduced in the Senate (S. 3052). The legislation was passed by the House Ways and Means Committee on December 17; by the full House on December 19 by a vote of 385-41; by the Senate Finance Committee on January 7, 2020; and by the full Senate on January 16 by a vote of 89- 10. President Trump signed the legislation on January 29, 2020 (P.L. 116-113)."
CRS In Focus, IF10997
Congressional Research Service: https://crsreports.congress.gov/